Abstract:

Soil microorganism numbers change after the Atrazine herbicide being applied in the soil. By taking Atrazine as the
research object, the experiments were divided into four stages: early, middle, late, end. In the present study, the effects of Atrazine on soil microorganism numbers were investigated through dilution-plating method. The results indicate that: Atrazine herbicide can change the soil microorganism numbers; it can inhibit the numbers of soil actinomycetes and fungi at four stages; Atrazine can promote the growth of the number of bacteria in the soil in the early, middle and late, but the inhibition in the end. On the whole, the Atrazine herbicide that being applied in the soil has inhibition on the numbers of actinomycetes and fungi, but there exists hysteresis nature in the inhibition on the numbers of bacteria.

Key words: Atrazine, soil microorganism numbers, fungi, bacterium, actinomycetes